What critical refinement did Hans Renold introduce to perfect the roller chain for cycling?

Answer

He inverted the shape of the chain link plates.

Renold's patented inverted tooth design ensured that as the chain engaged the sprocket, the load distributed more evenly across the rollers, significantly boosting efficiency and preventing premature failure due to uneven meshing.

What critical refinement did Hans Renold introduce to perfect the roller chain for cycling?
inventionchainmechanismdrive